Here's a real head scratcher for you...

[CoatiMundi]

It is an interesting one. Maybe if you buy four or five No4 (T) cheek pieces and stack them with really long screws, you *might* be able to get a cheek weld!

In my limited experience, the mount itself doesn't look home made. Looks like something off a machine gun or something like it with the round windage and elevation knobs. It does look like someone got really creative with a stamp set and a hammer! The other thing I noticed is the adjustments are in Mils, so I wouldn't guess the mount came from the US originally.